metapost: Interface to 'MetaPost'

Provides an interface to 'MetaPost' (Hobby, 1998)
<http://www.tug.org/docs/metapost/mpman.pdf>.
There are functions to generate an R description of a 'MetaPost'
curve, functions to generate 'MetaPost' code from an R description,
functions to process 'MetaPost' code, and functions to read
solved 'MetaPost' paths back into R.